terms - PHP Warning: Attempt to read property "slug" on bool in tax query

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In the tax_query, I have used the 'term' = array( $category->slug ). I'm getting an error notice where using $category->slug, however, in the frontend it displays the slug of the term.

Please help me to debug it.

// Shortcode [phd_vacancies]

<?php

add_shortcode( 'phd_vacancies', function() {
    
    ob_start();
    
    global $post; // data from the current post in the WP loop
    
    $categories = get_the_terms( get_the_ID(), 'country' );
    
    foreach( (array) $categories as $category ) {
        $args=array(
            'post_type' => 'job',
            'post_status' => 'publish',
            'posts_per_page' => 10,
            'orderby' => array('title' => 'DESC'),
            'tax_query' => array(
                'relation' => 'AND',
                array(
                    'taxonomy' => 'country',
                    'field'    => 'slug',
                    'terms'    => array( $category->slug ), // PHP Warning: Attempt to read property "slug" on bool
                ),
                array(
                    'taxonomy' => 'position',
                    'field'    => 'slug',
                    'terms'    => array( 'phd' ),
                ),
                array(
                    'taxonomy' => 'current-status',
                    'field'    => 'slug',
                    'terms'    => array( 'ongoing' ),
                ),
            ),
            //'no_found_rows' => true,
            'cache_results' => false, 
        );
    }
        
$query_phd_vacancies = new WP_query( $args );

    echo '<h3>'. esc_html( $query_phd_vacancies->found_posts ) . 'PhD Positions available in' . esc_html( $category->slug ) . '</h3>(now viewing first' . esc_html( $query_phd_vacancies->post_count ) . 'only)<br>'; // PHP Warning: Attempt to read property "slug" on bool
    
    if( $query_phd_vacancies->have_posts() ) {
        while( $query_phd_vacancies->have_posts() ) {
            $query_phd_vacancies->the_post();
            ?>
            <li><a href="<?php the_permalink()?>" target="_blank" rel="noopener noreferrer">
            <?php the_title(); ?>
            </a></li>
            <?php
        }
    }else echo 'Sorry No PhD Positions found';

    wp_reset_postdata();

return ob_get_clean();

}
);

本文标签： termsPHP Warning Attempt to read property quotslugquot on bool in tax query